吴然,张琳,许伟刚,卜诗,柳林

• 1:常州大学机械工程学院
• 2:常州大学江苏省绿色过程装备重点实验室

摘要(Abstract)：

为研究旋流对小颗粒凝并过程的影响,研究通过整合Lech Gmachowski Brown凝并核模型、湍流凝并核模型和XIAO提出的剪切破碎核模型,建立了一个考虑剪切流影响的适用于全粒径范围的颗粒凝并模型。首先计算了初始粒径为0.5μm的颗粒凝并效率,对比前人实验数据,验证了新模型对于湍流场过渡区内颗粒凝并行为的适应性。然后考察了旋流运动对亚微米和微米级颗粒凝并的影响,结果表明,旋流影响了亚微米级颗粒的自由扩散,促使不同粒径颗粒分离,从而降低凝并效率;对于微米级颗粒,旋流增加了小颗粒的碰撞概率,但无法提升凝并效果,旋流速度越高,凝并效果越差;在旋流场中设置轴向扰流板,可以改善小颗粒凝并效果。

关键词(KeyWords)： 凝并模型;旋流场;亚微米级及微米级颗业;扰流板

Abstract:

Keywords:

基金项目(Foundation): 江苏省科技厅重点研发计划项目(BE2016211);; 江苏省“六大人才高峰”创新人才团队(GDZB-CXTD-001);; 江苏省研究生科研与实践创新计划项目(KYCX17_2085);; 江苏省大学生创新创业训练计划项目(201710292034Y);; 2016国家青年自然科学基金(51606014);; 2016江苏省青年自然科学基金(BK20160281);; 2016江苏省高校自然科学基金(16KJB470001)

作者(Author): 吴然,张琳,许伟刚,卜诗,柳林

参考文献(References)：

• [1]张会君,卢徐胜.控制PM2.5的除尘技术概述[J].中国环保产业,2012,3:29-33.ZHANG H J,LU X S.Explication on controlling PM2.5 precipitation technology[J].China Environmental Protection Industry,2012,3:29-33.
• [2]陈亚伟,熊扬恒,周建龙,等.凝并元件结构优化对气固两相流流场及颗粒凝并效果的影响[J].热力发电,2016,45(1):60-64.CHEN Y W,XIONG Y H,ZHOU J L,et al.Influence of coagulation element structure optimization on gas-solid two-phase flow field and particulate coagulation[J].Thermal Power Generation,2016,45(1):60-64.
• [3]刘含笑,姚宇平,郦建国,等.凝聚器二维单扰流柱流场中颗粒凝并模拟[J].动力工程学报,2015,35(4):292-297.LIU H X,YAO Y P,LI J G,et al.Coagulating simulation of particles in flow field of coagulator 2D single turbulence column[J].Journal of Chinese Society of Power Engineering,2015,35(4):292-297.
• [4]刘定平,罗伟乐.基于旋流与声波的颗粒复合凝并建模与运动轨迹仿真[J].动力工程学报,2017,37(5):413-417.LIU D P,LUO W L.Moving trajectory simulation of particles and modeling of the complex coagulation based on swirl and acoustic wave[J].Journal of Chinese Society of Power Engineering,2017,37(5):413-417.
• [5]TEICHMANN J,BOOGAART K G VAN DEN.Cluster models for random particle aggregates-Morphological statistics and collision distance[J].Spatial Statistics,2015,12:65-80.
• [6]PESMAZOGLOU I,KEMPF S,NAVARRO-MARTINEZ.Large eddy simulation of particle aggregation in turbulent jets[J].Journal of Aerosol Science,2017,111:1-17.
• [7]LEE S H.Numerical study of aggregation and breakage of particles in taylor reactor[J].Transactions of the Korean Society of Mechanical Engineers B,2016,40(6):365-372.
• [8]HARSHE Y M,LATTUADa M.Breakage rate of colloidal aggregates in shear flow through stokesian dynamics[J].Langmuir,2012,28(1):283-292.
• [9]FENG X,HUI X,XIAO Y L,et al.Modelling particle-size distribution dynamics in a shear-induced breakage process with an improved breakage kernel:Importance of the internal bonds[J].Colloid s and Surfaces,2015,468:87-94.
• [10]徐挺,魏文韫,孙白宇,等.气液交叉流脱除亚微米级颗粒物的研究[J].高校化学工程学报,2017,31(4):960-969.XU T,WEI W Y,SUN B Y,et al.Study on sub-micron particle removal by gas-liquid cross-flow array systems[J].Journal of Chemical Engineering of Chinese Universities,2017,31(4):960-969.
• [11]SMOLUCHOWSKI M V.Experiments on a mathematical theory of kinetic coagulation of colloid solution[J].Zeitschrift Fur Physikalische Chemie-Stochiometrie Und Verwandtschaftslehre,1992,2:1777-1786.
• [12]BANHELMES G,PRATSINIS S E,BUGGISCH H.Particle size distributions and viscosity of suspensions undergoing Shear-induced coagulation and fragmentation[J].Chemical Engineering Science,2003,58(13):2893-2902.
• [13]YIMER I,CAMPBELL I,JIANG L.Estimation of the turbulent Schmidt number from experimental profiles of axial velocity and concentration for high-reynolds-number jet flows[J].Canandian Aeronautics and Space Journal,2002,48(3):95-200.
• [14]LAW A W K.Velocity and concentration distributions of round and plane turbulent jets[J].Journal of Engineering Mathematics,2006,56(1):69-78.
• [15]HO C A,SOMMERFELD M.Modelling of micro-particle agglomeration in turbulent flows[J].Chemical Engineering Science,2002,57(15):3073-3084.
• [16]FLAGAN R C,SAROFIM A F.Coal generated inorganic aerosol:A review[C].First international Aerosol Conference,1984,23(4):778-782.
• [17]GMACHOWSKI L.The aerosol particle collision kernel considering the fractal model of particle motion[J].Journal of Aerosol Science,2013,59:47-56.
• [18]FUCHS N A,SUTUGIN A G.Hihgly dispersed aerosols[M].London:Ann Arbor Science Publishers,1970.
• [19]XIAO F,LI X Y.Modelling the kinetics of aggregate breakage using improved breakage kernel[J].Water Science and Technology,2008,57(1):151-157.
• [20]ODRIOZOLA G,SCHMITT A,MONCHO-JORDA A,et al.Constant bond breakup probability model for reversible aggregation processes[J].Physical Review E,2002,65(3):151-156.
• [21]徐俊波,张丽,岳仁亮,等.PM2.5细颗粒物凝并的计算流体力学模拟[J].计算机与应用化学,2013,30(80):831-834.XU J B,ZHANG L,YUE R L,et al.Computational fluid dynamics simulation of coagulation of PM2.5 fine particles[J].Computers and Applied Chemistry,2013,30(80):831-834.
• [22]PATRUNO L E.Analysis of breakage kernels for population balance modelling[J].Chemical Engineering Science,2009,64:501-508.